Operating Modes - Grundfos DMX 221 Instrucciones De Instalación Y Funcionamiento

11.2.3 Operating modes

The selection of the operating mode (manual or analog) can be made via a central control unit.
• If analog input 1 (AIN 1) is activated, manual mode is selected. The VFD is operated via the
potentiometer.
• If analog input 2 (AIN 2) is activated, analog mode is selected. The VFD is operated via ana-
log signal 4-20 mA.
Permanent setting of operating mode (VFD variant A)
If there is no central control unit, the operating mode can be set permanently to manual or analog.
The VFD is default set to manual operation via the potentiometer.
Manual operation via the integrated potentiometer (default)
• Terminals 43 and 22 are connected with a jumper.
• Digital input 2 is activated.
• AIN 1, which is assigned to the potentiometer, is activated.
• Speed control is only possible via the potentiometer.
For 4-20 mA analog operation, make the settings described below.
Changing operating mode to analog operation (optional)
• Disconnect the jumper from terminal 22 and connect it to terminal 23.
• Digital input 3 is activated.
• AIN 2 is activated.
• Signal input is made via the terminals 40 (-) and 16 (+).
Fig. 11.2.3-1 VFD terminals
Operating modes for other VFD variants (B - E)
Read the supplier manual "BU 0180" for the VFD supplied with the product.
Read the supplier manual "BU 0180" for the VFD when setting the operating
mode for a VFD variants B-E.
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